Drilling apparatus



Aug. 4, 1942. A. c. KOETT DRILLING APPARATUS Filed Jan. 16, 1940 W C M M ATTORNEY;

Patented Aug. 4, 1942 UNITED STATES 4 PATENT OFFICE.

DRILLING APPARATUS Albert C. Koett,-Cincinnati, Ohio Application January 16, 1940, Serial No. 314,129

1 Clairn.

This invention relates to tool driving apparatus and is particularly directed to an extended tool driving mechanism or attachment for auger bits, screw drivers, nut runners, etc., for example an attachment for electric drills for drilling holes in confined spaces as, for example, drilling holes through joists for receiving electrical wiring.

shaft for extending the drive upwardly to the region of the joist, presents a problem of transmission. Moreover, the drill should be adjustable to any angle for drilling the hole in the joist at the correct angle. Because of close quarters, the problem of adjustment is magnified.

In view of these problems, it has been one of the objects of the present inventor to provide a tool driving attachment readily adaptable and conveniently attached to a standard power driven drill. Furthermore, it has been his object toprovide that the apparatus is extensible for greater reach and its tool driving head adjustable within confined spaces. Although the problems attendant the drilling of joists are set forth, the

invention is directed to an extended driving apparatus for tools of any sort.

More particularly, it has been the object to provide an extended drive which is angularly directed at its upper end through an easily adjusted joint, which joint may be set at any selected degree of angularity for the tool and firmly held in position. The drive through the joint is extremely simple and the parts required are reduced to an absolute minimum. The arrangement provides for adjustment of the tool through 360 degrees in any direction. That is to say, for any position of the attachment, merely by rotating the extension and thereby swinging the angularly adjusted tool, the tool may be operated in an selected direction.

Other objects and certain advantages will be more fully apparent from a description of the accompanying drawing, in which:

Figure 1 is a side view of a tool driving apparatus incorporating the present improvements.

Figure 2 is a view of the apparatus taken-at Figure 3 showing the shaft within the standard.

Described in general, one embodiment of the invention as illustrated herein, may consist of an extensible column or standard including an adjustable drill head through which standard the drive shaft is extended and mounted. The head may be rotated' through 360 degrees and, of course, the drive shaft is arranged so as to permit this. Since the standard is extensible and likewise the drive shaft extends with it, the attachment is mounted on the drilling motor particularly the hub thereof, by means of a bracket.

Referring to the drawing, the power source, in this case an electric motor, is indicated at ID. This drilling unit is conventional. 'It provides the usual handle I l brace or stock l2, and driving chuck l3. The drive shaft (not shown) is supported in the usual hub M. The chuck I3 is adapted toreceive a drill which, in this case, is replaced by the drive shaft extension.

The extensible drive shaft supporting standard or post I5 is formed ofsquare tubing the lower section [6 of which has its lower end clamped between the sections I8-of the bracket II. The sections l8 of the bracket are C-shaped including upper cooperating clamping portions drawn about the lower end of the section l6 and lower clamping portions drawn about the hub I4 of the drill.

The upper end of the post section l6 (Figure 4) carries a collar l9 which is fixed in position thereon. One side wall of the section I6 is made flexible by longitudinal cuts 20 adjacent the corners of the post. The flexible portion thus constituted is forced against the upper post section 2| by means of a set screw 22 having a wing nut head and screwed through the collar against the flexible portion. The upper end of the post section 2| carrie the fixed portion of the knee or joint which permits angular adjustment of the drill. A coupling 23 is fixed directly to the upper end of the section 2|. A transmission casing 24 has a. screw threaded sleeve portionthreaded into the coupling 23. A second transmission casing 25 is rotatably mounted on the first element 24 for rotation in a plane parallel to and at one side ofthe axis of the post. The engaging faces of the elements 24 and 25 provide telescoping flanges for a rotatable bearing connection.

A fixed clamping stud and shaft 25 is extended through the elements 24 and 25 on their axes. This shaft passes loosely through the element 24 and is fixed in the element 25. A wing nut 21 is loosely mounted on that; end of the stud traversing the stationary element 24 and when drawn against this element, clamps the two elements together.

The drive proceeding from the chuck |3 of the electric drill unit consists of a short shaft extension 28 fixed in. the jaws of the chuck. The

upper end of this element is fixed within a square tubular section 29 of the drive shaft. The upper section 30 of the drive shaft is telescopically engaged over the section 29. The upper end of the section 30 is disposed around and fixed to the square end of the driving stud 3|. This stud is journaled in the fixed bearing sleeve 32, fixed in the transmission casing element 23.

A bevel pinion 33 is pinned to the upper end of the driving stud 3| and meshes with a bevel gear 34 fixed upon the hub of an oppositely facing bevel gear 35. These gears are riveted together and rotate as a unit on the shaft 25. A spacer sleeve 31 is provided on the shaft between the gear unit and the rotatable casing element 25. When the wing nut is tightened to fix the casing element 25 against rotation, the sleeve provides ample clearance for rotation of the bevel gears.

The bevel gear 35 meshes with a pinion 38 fixed to the angularly disposed spindle 39. The shaft 39 is ,iournaled in a bearing sleeve 40 fixed in a sleeve extension of the element 25 disposed parallel with the main drive shaft. A seal is provided for the spindle 39 where it extends out of the casing arrangement. This seal consists of a fiat fiber washer 4| held against a cap 42, screwed on the extension of the casing. A nut 43, screw threaded on the spindle, holds the packing against the cap. A chuck 44 is provided on the spindle 39 and the drill 45 extends from this chuck.

As shown in Figure 2, the angularly disposed drill spindle has been adjusted at right angles to the standard l and is shown drilling a hole 45 in a joist 41 parallel to the fioor 48. It will be seen that the sections l8 and 2| may be telescopically adjusted so as to place the drill at the right height in accordance with the reach of the operator from the floor.

The drill may be directed in any direction. It may be swung'vertically through 360 degrees, as shown, or it may be swung through 360 degrees at right angles to the swing shown in Figure 2, by rotating the drill and standard, in fact the whole unit on the axis of the standard.

In order to prevent complete detachment of the standard sections, a detent latch is provided. This latch consists of a spring plate 5| fixed to the outer section l5 including a pin 52 disposed through an aperture 53 in the section. This pin engages the inner section 2| and is adapted to drop into an aperture 54 at the lower end of the section for preventing detachment.

Having described my invention, I claim:

In a tool driving apparatus of the type including a standard and a drive shaft extending through said standard; an adjustable tool driving head mounted on the outer end of said standard, comprising a transmission casing consisting of abutting substantially circular casing sections, one of said sections being constructed and arranged to rotate upon the other about a combined shaft and drawbolt extending through said sections on anaxis extending transversely of, and being intersected by, the axis of the drive shaft, means on said drawbolt for clamping said I relative rotation, said and extending radialsections together against standard being attached to ly from said nonrotatable element, a radial extension on the rotatable section, a chuck shaft mounted in and extending radially from said radial extension, a gear unit having oppositelyfacing bevel gears thereon back to back, said gear unit being loosely mounted on said combined shaft and drawbolt within said casing sections, a bevel pinion fixed on said drive shaft and meshing with one of said gears of the unit and a second bevel pinion fixed on the chuck shaft and disposed in mesh with the other gear of the unit, whereby axial pressure on thechuck shaft is always exerted directly toward the axis of the combined shaft and drawbolt.

ALBERT C. KOETI. 

